Pinpoint Tests AC: The Traction Control Off Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests


Pinpoint Test AC: The Traction Control Off Indicator Is Never/Always On

Normal Operation

The traction control switch is hardwired to the Instrument Panel Cluster (IPC). When the traction control switch is pressed, the IPC sends a message to the ABS module over the High Speed Controller Area Network (HS-CAN) communication bus. The ABS module either disables or enables the traction control and sends a message back to the IPC to turn on or off the traction control off indicator based upon the system state. If the traction control switch state message is missing for less than 5 seconds, the traction control off indicator remains in the last indication mode (on or off) based upon the last known good message received. If the traction control switch state message is missing for more than 5 seconds, the IPC sets DTC U0121:87 in continuous memory and defaults the traction control disabled indicator off.

This pinpoint test is intended to diagnose the following:

- ABS module
- IPC



PINPOINT TEST AC: THE TRACTION CONTROL OFF INDICATOR IS NEVER/ALWAYS ON

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AC1 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

Yes
For DTC U0121:87, GO to Pinpoint Test AR. Pinpoint Tests AR: DTC U0121:87

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to AC2.

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AC2 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Enter the IPC active command mode and select the traction control off indicator (STAB_TC_LMP) active command. Command the traction control off indicator on and off while observing the traction control off indicator.
- Does the traction control off indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to AC3.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AC3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST


- Check for recorded DTCs from the ABS self-test.
- Are any DTCs recorded?

Yes
REFER to Antilock Brakes / Traction Control Systems.

No
INSTALL a new ABS module. REFER to Antilock Brakes / Traction Control Systems. TEST the system for normal operation.

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